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STATUTORY FINANCIAL INFORMATION (DETAILS)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
board_member
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Statutory Financial Information [Line Items]      
Statutory net income $ 598,000 $ 457,000 $ 884,000
Bermuda [Member]      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 1,835,279 1,948,833  
Available statutory capital and surplus 4,055,252 3,619,642  
Minimum solvency margin amount $ 100,000    
Minimum solvency margin percentage of net written premiums 50.00%    
Minimum solvency margin percentage of net reserves 15.00%    
Minimum solvency margin percentage of ECR 25.00%    
Limit - prior year's total statutory capital surplus (Bermuda) 25.00%    
Number of directors required to sign affidavits in order to pay dividend/distribution greater than 25% of prior year statutory capital and surplus | board_member 2    
Maximum dividend/distribution payable without regulatory approval $ 1,000,000    
Ireland [Member]      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 552,678 282,857  
Available statutory capital and surplus 925,164 781,892  
Maximum dividend/distribution payable with regulatory approval 372,000    
U.S. [Member]      
Statutory Financial Information [Line Items]      
Required statutory capital and surplus 430,145 412,990  
Available statutory capital and surplus 1,470,772 $ 1,439,366  
Maximum dividend/distribution payable without regulatory approval $ 147,000    
Maximum dividend limit - percentage of total statutory capital and surplus 10.00%